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Grants system server access to /proc/<pid>/oom_adj for Android applications.

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Signed-off-by: Brian Swetland <swetland@google.com>
This commit is contained in:
Mike Chan 2008-04-24 10:22:26 -07:00 committed by Arve Hjønnevåg
parent 68d0e19e91
commit aa3305f2ba
1 changed files with 36 additions and 1 deletions
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37
fs/proc/base.c
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@ -139,6 +139,12 @@ struct pid_entry {
NULL, &proc_single_file_operations, \
{ .proc_show = show } )
/* ANDROID is for special files in /proc. */
#define ANDROID(NAME, MODE, OTYPE) \
NOD(NAME, (S_IFREG|(MODE)), \
&proc_##OTYPE##_inode_operations, \
&proc_##OTYPE##_operations, {})
/*
* Count the number of hardlinks for the pid_entry table, excluding the .
* and .. links.
@ -1000,6 +1006,35 @@ static ssize_t oom_adj_write(struct file *file, const char __user *buf,
return err < 0 ? err : count;
}
static int oom_adjust_permission(struct inode *inode, int mask)
{
uid_t uid;
struct task_struct *p;
p = get_proc_task(inode);
if(p) {
uid = task_uid(p);
put_task_struct(p);
}
/*
* System Server (uid == 1000) is granted access to oom_adj of all
* android applications (uid > 10000) as and services (uid >= 1000)
*/
if (p && (current_fsuid() == 1000) && (uid >= 1000)) {
if (inode->i_mode >> 6 & mask) {
return 0;
}
}
/* Fall back to default. */
return generic_permission(inode, mask);
}
static const struct inode_operations proc_oom_adj_inode_operations = {
.permission = oom_adjust_permission,
};
static const struct file_operations proc_oom_adj_operations = {
.read = oom_adj_read,
.write = oom_adj_write,
@ -2697,7 +2732,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("cgroup", S_IRUGO, proc_cgroup_operations),
#endif
INF("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
ANDROID("oom_adj", S_IRUGO|S_IWUSR, oom_adj),
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),